xref: /gem5/src/arch/x86/isa/formats/nop.isa

// -*- mode:c++ -*-

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// Authors: Gabe Black

////////////////////////////////////////////////////////////////////
//
// "Format" which describes an instruction whose only purpose is to
// call a syscall in SE mode.
//

output header {{
    class SyscallInst : public X86ISA::X86StaticInst
    {
      public:
        static const RegIndex foldOBit = 0;
        /// Constructor
        SyscallInst(const char *_mnemonic, ExtMachInst _machInst,
                OpClass __opClass) :
            X86ISA::X86StaticInst(_mnemonic, _machInst, __opClass)
        {
        }

        std::string generateDisassembly(Addr pc,
                const SymbolTable *symtab) const;
    };
}};

output decoder {{
    std::string SyscallInst::generateDisassembly(Addr PC,
            const SymbolTable *symtab) const
    {
        std::stringstream response;

        printMnemonic(response, mnemonic);
        ccprintf(response, " ");
        printReg(response, _srcRegIdx[0], machInst.opSize);
        return response.str();
    }
}};

def template SyscallExecute {{
    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
            Trace::InstRecord *traceData) const
    {
        Fault fault = NoFault;
        %(op_decl)s;
        %(op_rd)s;
        %(code)s;
        return fault;
    }
}};

def format SyscallInst(code, *opt_flags) {{
    iop = InstObjParams(name, Name, 'SyscallInst', code, opt_flags)
    header_output = BasicDeclare.subst(iop)
    decoder_output = BasicConstructor.subst(iop)
    decode_block = BasicDecode.subst(iop)
    exec_output = SyscallExecute.subst(iop)
}};